ptalog barcode generation: decrease module size, increase quiet zone

#ifdef PTALOG_GPIO_BAR

		void startTransition(char const *code, uint8_t code_length)

		{

			// TODO increase sleep duration: quiet zone must be at least 10x long

			// (100ms for 10ms per bar, oder 50ms for 5ms per bar)

			arch.sleep_ms(20);

			// Quiet zone (must last at least 10x longer than a module)

			arch.sleep_ms(60);

			for (uint8_t byte = 0; byte < code_length; byte++) {

				for (uint16_t mask = 0x01; mask <= 0x80; mask <<= 1) {

					// a single module, which is part of a bar

					gpio.write(sync_pin, code[byte] & mask ? 1 : 0);

					arch.sleep_ms(10);

					arch.sleep_ms(5);

				}

			}

			gpio.write(sync_pin, 0);

			// TODO increase sleep duration (see above)

			arch.sleep_ms(20);

			// Quiet zone

			arch.sleep_ms(60);

		}

#else

		inline void startTransition()